Modify the sh-bang to run out-of-the-box for FreeBSDes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155230 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/release/findRegressions-simple.py b/utils/release/findRegressions-simple.py
index 7586231..8d3b4cf 100755
--- a/utils/release/findRegressions-simple.py
+++ b/utils/release/findRegressions-simple.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 import re, string, sys, os, time, math
 
 DEBUG = 0